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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84906383c49ff6c1af535490be05d41af01a9438d2ae1cc1df875dce55c9ef63' 
  AND token = 'l1LwaVo2NOpcn9LRHbkqofreX6vWgHggAfoe5mYtxgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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