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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e37aa0613336541b9cb6343cbbbe37c35bbaeff47297b9a84f39c9b8745da0' 
  AND token = 'ZB2T4uanN/kzo98iImiAl7eDry0jH6/eoE1kv581e08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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