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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a3f10d7367d2eabd809dccbc7a3ac17aefb36ee0079161577dfdef1613b803' 
  AND token = 'An1lCAAQg8VCX8lOpQ/smGZuGs+hALKhmm+O0Mq0Q7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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