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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0311469adae7e2a57d19e55de7a29cabde6a41ec960d5193c2d9bcf0fdb843b8' 
  AND token = 'bxJNUUuRcebF7jcTn641R0vpJR4Ydn05jMNMZlExz5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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