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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008babb9bdc482bdc9b0f30a83d4577653c8873be5b181b339eae0dede0002b4' 
  AND token = 'U8uaew5WWoP3pnSClGoxm0UZe4C9g5idpxUJW2GJmPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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