SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27d85fd7ddc8f706640949913a7171fca365193eec61dea60610a1e763003b3' 
  AND token = 'B89ZXHMgge+Ym4Q/FFBP2HqFu2Uqa5gRyCBpBf+KFLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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