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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593d321a7f3387bb4756d6283c191c33c57c4abaf458baa08353903bfb7c8460' 
  AND token = '1U/9ufTpOwVNW5OhRzvtpFJ+++D+Uq1Pp0RQNvxT6yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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