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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae6887b6b5399f52dcb82c4d72424ab6db76e8454d7345f262196dc392a6b53' 
  AND token = 'Zeu/ml2ZGs2e4gqIKIspLgfU4DLIx/zATARlfLxTRGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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