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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffd2c56d0e676e1bf37abad0a32becd9fce91bd011ee9189ccf221e46f2b940' 
  AND token = '1hVBFAa0ZEboym8N9zB4BoxDTvTQz/WVr0UfI0zeUv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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