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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc8516f176c5c90c8f7d7866d4ef3fa1639e66af0e990016c50ca851f72cf33' 
  AND token = '6tcseffdDHqFYqJSnPIcRy9kjr+y5zHXNr+gic62guo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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