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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af99299701bc0900bfe3a5289fdc04d3fded18937a66de3b3060d38bd30a4006' 
  AND token = 'cNln0qoqdTtDpgGsdWSeLGgNe9QNvPheEpi6VUK3J1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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