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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2cf24c08e559b90858140f166f8eb14e05a038d7c0c19ddf1cfc4c6ba124ce7' 
  AND token = 'm8QHsE7b/ZiP1lniszJ4l5ACmGvcTvyMJh+8R1GnfjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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