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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fddcc3ebfe39720d3c26920bfb4716a5cbf55bdf90b1982141ce8a7cc998e2' 
  AND token = 'JlPT1eLBaIs8tG79WIrkS8z/l9TH0eUObn8hZslQkQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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