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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bcd0c79ee9a5c6491625ba13cdd9b327dee6bc1e54afac4370fb4e4a4279f1' 
  AND token = 'TGFGHAspu2eY6V/wkPLb35uEotaOFRFGH9ONBi+srO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}