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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bc921746bb4591f2d11b9d7162ef49e6d361f54f998cf61e300bd7f76d263d' 
  AND token = 'iH9NluyUxZKsjYkizlGawlunFaUs1aJ74CoqnisHrS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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