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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929676690324f2cb728c6f4ccf1d3079025d84840a9d1497c94a437395d0de83' 
  AND token = 'H4vsHUOkm1X/En+QlP0Az0EqrN9TKpXUiEMsK9hlSD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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