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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28583c8e873b401d61e3de505e7c470a8ec9d3e425dbf96a3edb0cb12ee62ebc' 
  AND token = 'ibbpsR+b2q3uCiD/7sr8vfZ+ImA3gSu+AfliToRVoPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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