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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2065d73240be231e94976545a8d3af980cf9c3d819774499d9651c74cdaa5f4' 
  AND token = 'YxZu6h+2cUshgqyVqfgMWZaZMQK6tS2D9n4EaDXLlt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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