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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34813fc9b64b0e5963eb84033b1f66b76e73996ce6df7bc7d91d67b2530d12e' 
  AND token = 'h7fc3M2ILS86zuNSou7CVgPrSJbXQSr0Mr+17WxXo5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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