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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cdc3066842788ecd4d23a6d81772befb8ac878679c7cd3bc290deb3697af16' 
  AND token = 'q3297xXtrVR04ShTCDns/z9Cv2MKBsSUsEN5Vg0p97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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