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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc476bb1ad6e46a5c76163b7fb19796a1fe8680adb448cea7ae0c49a10e4c18' 
  AND token = 'Nd/2igCjeFOZTF9yibVuWfszFw8PAJy/L5ej0oNQZGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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