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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ae4c1769cd7ffa45486018053af4b36d0ecac74f91ab4235cf9a3602f40305' 
  AND token = 'wgjD3S8auksBdfUCtNimzOnVDJHtcjSeGC+wAVoOO9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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