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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadc3c2e98d9eb44b9711a4f4dd580876331f31b9c45e910ce88a6a054ab6042' 
  AND token = 'wJuj1pgMj6M8XC4ZKFlPPQjPXmUKfc20a5DVt0eohK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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