SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46199057fb9e7a1ad33526f456e693285d4cbe4f74c03bf461dfa23d00ba2654' 
  AND token = 'WaV9pXAMyBjXBqerKkX1XlPYfnIv3aDs9RKNNz1VhQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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