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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfc39dc2119538fd61162e97cd386fdd1a34308df0e5840a7181915c89c8204' 
  AND token = '8nulJuh6fRgvUhcI78GIgf9fd3w5zPJ/cT3sCC/7mq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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