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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3bc14787802bca46adef3b45de2d7dda5f5f705bcc12f7d754dc6c5f470967' 
  AND token = 'YFlkwv9OCUMn91t9HIs2kNz10QETtOsLTJoDy557lY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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