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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc96d9d7278e82ebbad3ef48b4f7e36a0d1bad28d0a4e19067626e3cb7e7e48a' 
  AND token = '5ZL/7oLOkqb6Iua3SrnSLo2K2IqgQ4CErw8KCb5dID0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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