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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32965c56deb2ebc94c638e622503da098b8623dc051e482844920332b0f62436' 
  AND token = '1yTTOZ0hMlXIieC871kXsx0ooJPNL4POymYDvmWl05Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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