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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3503778905318d7ebaa51ee0ae63fb7fd93ff784e4bb40738fb3e05c0a6a4c4b' 
  AND token = 'pb6M49xY7SLMMRghKs1n2W3yzGW0zS1+muGHjTSSqwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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