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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52dbb6bee4d9b8ba98dc7138d969ca6148054d1b87faa7cacb800c0509e23aaf' 
  AND token = 'sVoWzaDsHHnWE0Elt2SbGjEiGK1lmC1tEiKzCLaT0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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