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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc9018f0f215739409e1c33476028bde5710fdd824ac6acbf5cbbd883b7347d' 
  AND token = 'MwFJhDVC2UEMyQjGwjD5w1N2gvEabdDARV7OpPNcs6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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