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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc24c24f40e5f224ab553620342a9d1a4fcf9b5efb425265291a65032689a02f' 
  AND token = 'PGREvNQOBEtbUu0cD/QbhOP/ijZJ6urqs37T4PqLly0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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