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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd071bb6f1c90dfd232f01516f5538212df3ba7d5cff708bb6489825e54b52176' 
  AND token = '17Ul9bFzM60DKisPYQIoUjpHTQ3rfxMeOQmlDQZB/1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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