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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f3b0c696ef14bd03c4f4f77798a2b362b0edb7a54b2621b3b1cd9ac1439ae0' 
  AND token = 'Wv2TZSyMYXSTpopxaLGSdM5E5BczRqKSn4ZiVkzuwjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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