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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96935f5dda772b1553215ddb2696159f5a7d1875972f4848c93f658cc8d487ae' 
  AND token = 'K5riwnupd28f+WvsdDWGtL8A0XCDDgo/ehc4N+8eHXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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