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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fb4a37665b070034521f33b645ff5e32a56fc5ca4fe43604741a4f61c2f72b' 
  AND token = 'OR2Fgx8DovTl4UeVF9qrKCPc0d0VxmD0UxkkEtXe9Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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