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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c680b93f8b6de44f15f300382ff2ccda0961fe856b254c5b0643f1ae8ee4e4' 
  AND token = '9q/YOgCPX2ZvkXJUEzv3oaIWcI3jHICMrETkm+H0du8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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