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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd247b93fed97d1db7b300dc3a533ab03ffc5f65b6340f68de5d27e5303d8c118' 
  AND token = 'BN4UdLE7y9RNs6kvjwFnS3pIqOSXSx107mz6MHt2AIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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