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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f704921fb2dcb6a49ac376f4c6b1edc736dbcf417dec6916cf82231e1788c1a6' 
  AND token = '8uImpMryjz96rgzj/DUXiB4MEZBu7Gg5lTXWv0IOKp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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