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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f9f0747c580afd5b80376bf1dcbff4717456f1a80f463bdce1a4b9d8c87511' 
  AND token = 'Mx9YMkpTle0RgzGzqNC0NuP03/s5fT5o65XuQZDnHCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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