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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731fb2b83fa2240db5793b7845509f1d2e27b735c0be1844b71cee332cd10a23' 
  AND token = 'zLiEZs6aVgB9gxatjjEhCW0aHK3CCiXAy5xvVUVZGRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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