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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a75adefe0470cfbf3a714cb757b1be6a6d87dbe4dc67e7362fb7d73194726f' 
  AND token = 'i2XHUkbm4lFs6MXuuqmH05G6jWxmyuG52+v6+xeYolc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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