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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfeeb3ac116b4a4a3dc3cf0935162a1695a3333b27ddeff3d3236253a28f56b' 
  AND token = 'v3qUPn8fXJ6kAr91gjNhB86actgGFkUVkrdnvEUwDkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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