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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '457c8432c356d6244e37c5b6dd68bae88cfe7e67ad8013734cde772c1b1c66d8' 
  AND token = 'Ip7e9V117WMzrTbd/nLjbYqW865H8YgH9FN6uuG7iKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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