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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49e12cc370bda3839bef12d878ab41771495b32e07b001619926c938cc981e7' 
  AND token = 'wKw/j8DnlDPTWzITdKjQ7S3TqkMGu7JXjjbAw1pr174=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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