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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b836669e9acb45ac1a49d045eaa4a7c24eed9bc1f5811536dccb55792d0fd8' 
  AND token = '5YNwDe9+T48ABsD/ZWObYGb32Ia0V90WOa73Sh+qNjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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