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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7d024a8bbc231c44cddc5b426e22dc0caf7ae4edbaffd6f3a57c8b87d7c909' 
  AND token = 'PJtqiLjWLCslkHZsd42j7APGHFZimCYgZTYGTYOlSEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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