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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb656a86971a35c334f8fa11eb4e3c49aae357b0e638335cf12585361698a96' 
  AND token = 'ZQgQRHaOrI6R4O7cTWbAqfCRdRAROG5xdRpG6Yu1Vfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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