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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d6ffce473e3b9fdd88e40df6ef4473b35902979211cb5b08a8d466f306e1f4' 
  AND token = '9yd0rE4POfrKmqliEYUhc9Mhgvivh3u8+tSlLSa++1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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