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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a757ed3ff1c93fd860e4e3e94d570706a49105316ae7a6ad844c2b4dfc2d9ee9' 
  AND token = 'jq6wOGkD/oXm26hggRDncX/3HRF8YGjP1dU0j8arex4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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