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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e167236527aa587d1170dac1997ea3a90f79b6e5b0c6c5d458b68980628cf6f' 
  AND token = '8ljX/zvc4LlIdVth1e0S5GsvhblcOq/PujntvtQ05ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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