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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abb0d71847efd8990efa24a476d36bffd83941c04492c143334aa70dd9bd686' 
  AND token = '6ZDRESy0mIVRVCoazCATv0Gm2Whe++QTI+UU5cZ1kXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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