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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1483f7cf7adc9cbc6855c9deda6683a47755d02684f133f3ef8ffd397ac826b' 
  AND token = 'W2+3JOl43HUhRUQkBU+mWVB8o64qWnSXbTkm7QStz0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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