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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b04e194771c0c4f6f169af074c3952eb826464a7ad03410d6c1ab248ffc367' 
  AND token = '6g4H6hwGVZfAIPWYVBjAJw3OVC8R4UdSInpwEsaNoB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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